Hi - welcome.
I had my gallbladder out yonks ago. Have to be careful with fat. Am eating low carb and some fat....find I can tolerate nuts, some cheese, avocado, olives etc, bit of olive oil.....
If you are waiting to have your gallbladder out I guess you may have to avoid as much fat as possible to avoid an attack?
After surgery, some people find they can eat normal levels of fat (whatever normal is...!!) others, I think around 30% find they have to be careful. I'm in the 30%!
You can also take supplements to encourage bile production etc.
Am at work now, but do message me if there's anything you'd like to confer over and will get back to you tonight.
Have also learnt from reading posts that though people refer to lchf (high fat) some people eat just more fat, and stop avoiding all fat like we would if on low fat/calorie counting diet. if we have weight to loose, not eating too much fat ok, as we burn our own, but once weight target reached, may need to eat more fat to get enough calories/energy etc. Eating some fat is good for us anyway (omega 3s etc!!)
Good luck with the op.
All the best
Daffodils